Explanation:

- To calculate simple interest, use the formula: $$\text{Interest}=\text{Principal}\times \text{Rate}\times \text{Time}$$

- For a principal of Rs6,600 at 6.2% per annum for 2.5 years:

$$\text{Interest}=6600\times \frac{6.2}{100}\times 2.5$$

- This gives an interest of Rs1,023.

- Total amount is the sum of principal and interest:

$$6600+1023=7623$$

- Option 1: Rs7,222 - Less than the calculated amount.

- Option 2: Rs7,623 - Matches the calculated amount.

- Option 3: Rs7,852 - More than the calculated amount.

- Option 4: Rs7,546 - Less than the calculated amount.